This is proving a lot more complicated than expected...
Matching up the ink with a compatible cartridge distribution
mechanism is beyond the scope of my own expertise. I'm
electrical, not a chemical engineer.

That said though, conductive ink pens exist, and older
pen plotter printers exist. Should be much easier to adapt
the pen to the printer. It won't be as high-res as a more
modern ink-jet printer, but it should work. Proof of
concept is all I'm aiming for at this point.